<!DOCTYPE html>
<html>
<head>
	<title>下拉菜单</title>
	<meta charset="utf-8">
	<link rel="stylesheet" type="text/css" href="css/bootstrap.min.css">
</head>
<body>
	<div class="container">
		<div class="dropdown">
			<button class="btn btn-default" id="dlabel" type="button" data-toggle="dropdown" aria-haspopup="true" aira-expanded="false">
				下拉菜单
				<span class="caret"></span>
			</button>
			<ul class="dropdown-menu" role="menu" aria-labelledby="dlabel">
				<li>1</li>
				<li>2</li>
				<li>3</li>
				<li>4</li>
			</ul>
		</div>
	</div>

<script type="text/javascript" src="js/jquery-3.0.0.min.js"></script>
<script type="text/javascript" src="js/bootstrap.min.js"></script>
</body>
</html>